draco sent hermione a love letter as a "joke", he made the writing a bit messy so it won't be obvious that he's the one who made, it says "Hi I just want to confess my feelings to you. I really like you, since the first year. I love the way you move, your hair, your curves & all about ya." & he put " -from your secret admirer"

He quickly put it in her bag, he quickly sat on his seat & then when hermione came back, she opened her bag to find her book.